Brian Thomas Helgeland (born January 17, 1961) is an American screenwriter, film producer, and director. He is best known for writing the screenplays for the films L.

A. Confidential (1998) and Mystic River (2003). He wrote and directed the films 42, a biopic of Jackie Robinson; and Legend, about the rise and fall of the infamous London gangsters, the Kray twins.